Circuit-on-foil process for manufacturing a laminated semiconductor package substrate having embedded conductive patterns

摘要

A method of making a substrate for a semiconductor package includes providing a laminated layer structure including a backing layer and a metal layer attached to the backing layer. A circuit layer is plated atop a first surface of the metal layer to form a circuit-on-metal structure. The circuit-on-metal structure is coupled to a dielectric layer by causing the dielectric layer to flow around the circuit layer to the first surface of the metal layer so that the circuit layer is embedded within the dielectric layer and the first surface of the metal layer is in direct contact with a first surface of the dielectric layer. The backing layer is then removed completely. The metal layer is then removed completely.